Lectrosonics ALP690 User manual

ALP690

Active LPDA Antenna

INSTRUCTION MANUAL

Rio Rancho, NM, USA

www.lectrosonics.com

Fill in for your records:

Serial Number:

Purchase Date:

ALP690

LECTROSONICS, INC.2

Features and Functions

The ALP690 is a high performance LPDA (log periodic

dipole array) antenna with a built-in RF amplier for use

with wireless microphone receivers on location or studio

production. The antenna design delivers +4 dBd of

passive gain in a directional pattern to extend operating

range and suppress signals from the rear.

The antenna is formed with copper traces on a .133”

thick glass epoxy high-pressure thermoset plastic lami-

nate material with a durable nish. The skeletal structure

reduces wind loading in outdoor use.

RF gain, bandwidth and display brightness are adjusted

with a membrane switch keypad and LED display on the

control panel.

Active gain can be adjusted from +12dB to -6dB. Posi-

tive gain is used to compensate for long coaxial cable

runs between the antenna and a receiver or multicou-

pler. Negative gain can be used to oset the natural

pattern gain of +4dBd to achieve a level equivalent to

a dipole antenna, or in special cases where high power

transmitters are being used in close proximity.

When used as an active antenna, the lter bandwidth is

adjustable from 470 MHz at the lower end to either 608

or 700 MHz at the top end, to serve users’ needs in vari-

ous markets and locations.

The antenna is powered by DC bias inserted on the

coaxial cable connected to the 50 ohm BNC jack. This

power can be supplied by a Venue Series receiver, an

active multicoupler or an inline BIAS-T.

Power is provided by DC bias

on the output connector

The antenna will automatically switch to the passive

mode when no DC bias power is present on the BNC

connection.

Settings are made with a

keypad interface on the

control panel.

Active LPDA Antenna

Rio Rancho, NM 3

Reception Pattern

Vertical orientation provides a wide horizontal coverage

pattern and deep nulls directly above and below the

antenna. Viewed from the side, the pattern is weighted

forward with signicant rejection at the rear.

Viewed from above, the horizontal coverage pattern

extends across a broad angle.

FCC Notice

NOTE: This equipment has been tested and found to comply with the limits for a Class B

digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide

reasonable protection against harmful interference in a residential installation. The equip-

ment generates, uses and can radiate radio frequency energy and, if not installed and

used in accordance with the instructions, may cause harmful interference to radio com-

munications. However, there is no guarantee that interference will not occur in a particular

installation. If this equipment does cause harmful interference to radio or television recep-

tion, which can be determined by turning the equipment o and on, the user is encour-

aged to try to correct the interference by one or more of the following measures:

• Reorient or relocate the receiving antenna

• Increase the separation between the equipment and receiver

• Connect the equipment into an outlet on a circuit dierent from that which the

receiver is connected

• Consult the dealer or an experienced radio/TV technician for help

Changes or modications to this equipment not expressly approved by Lectrosonics, Inc.

could void the user’s authority to operate it.

ALP690

LECTROSONICS, INC.4

Powering

Power is provided by 8V to 16V DC bias on the center

conductor of the coaxial cable connected to the BNC

jack. The power can be supplied from an attached re-

ceiver, active multicoupler or the BIAS-T power inserter.

NOTE: The antenna will automatically switch

to the passive mode whenever no DC bias is

present on the BNC connection

DC POWER TO ALP690

ANT A ANT B

Antenna Power Jumpers

UMC16B MULTICOUPLER

ANT AANT B

Antenna Power Jumpers

or switch setting on LCD

VENUE SERIES RECEIVER

9 to 16 VDC

RF OUT

BIAS-T

9 to 16 VDC

RF OUT

BIAS-T

Active LPDA Antenna

Rio Rancho, NM 5

Mounting

The mounting block

supplied with the

antenna provides

threaded openings for

1/4-20 and 3/8-16

tripods, and a 5/8-27

threaded opening for

microphone stands.

The mounting block can be rotated 90 degrees by

removing the four screws, rotating the mounting block

and re-assembling.

Retain the four lock nuts with a

wrench or socket and remove the

screws from the opposite side.

NOTE: Other mounting conﬁgurations are

available using the optional ALPKIT shown in

the Optional Accessories listing.

Display brightness

Press and hold both UP and DOWN arrow buttons until

the power LED blinks and a b.(x) appears. Release the

buttons and immediately press the UP or DOWN button

to adjust the brightness. When the buttons are released

for about 2 seconds, the display will store the setting,

stop blinking and return to the normal operating mode.

PWR

Adjusting gain

The RF amplier applies 12dB of gain. Built-in attenua-

tors can be applied in 1dB steps to reduce the gain from

+12dB down to -6dB.

• Positive gain compensates for loss in longer co-

axial cable runs between the antenna and receiver

• Reduce the output level of the antenna to the level

of a standard dipole antenna (-4 setting)

• Reduce the output level of the antenna when high

power transmitters are used in close proximity to

the antenna

Press and hold either the UP or DOWN arrow until the

power LED blinks. Release the button and immediately

press the UP or DOWN button to adjust the gain to the

desired setting. When the buttons are released for about

2 seconds, the setting will be stored and the display will

return to the normal operating mode.

Calculating Needed Gain

Add up the loss caused by long coaxial cable runs,

splitters, etc. between the antenna and the receiver to

determine the total loss and set the gain to compensate.

For example, consider a 4-way passive splitter such

as the ZFSC41 with 6 dB of loss at each output and a

coaxial cable such as the ARG15 with 2 dB of loss, for

a total loss of 8 dB at the receiver. Set the gain at 8 to

oset the loss.

Adjusting bandwidth

Band pass lters are included in the circuitry to sup-

press RF signals above and below the useful bandwidth

of the antenna. The lter bandwidth can be set to 470

to 608 MHz (F. 6 ) for use in the US, or to 470 to 700 MHz

(F. 7 ) for use in export regions.

Press and hold the UP and DOWN arrow buttons until

the power LED blinks and continue to hold them for

another few seconds until the display switches to a

blinking F. 7 or F. 6 . Release the buttons and immedi-

ately press the UP or DOWN arrow button to change

the setting. When the buttons are released for about 2

seconds, the setting will be stored and the display will

return to the normal operating mode.

470 608 700 MHz

-10

Filter Bandwidths

F. 6

F. 7

ALP690

LECTROSONICS, INC.6

Optional Accessories

ALPKIT

Includes threaded sleeves and an all-thread stud for

mounting on 1/4-20 and 3/8-16 tripods and 1/2 inch

lighting clamps, and a sleeve adapter threaded for

microphone stands and the 3/8-16 all-thread stud that

comes with the antenna.

Threaded adapter

for standard lighting

clamps. 1/2” diameter

x 6 inch long. 3/8”-16

thread - both ends.

(PART # 26311)

1/4” - 20 threaded adapter

(PART # 28770)

Threaded adapter for

photo/video tripod

mounting. 1/2” diameter

x 1 3/4” long. 3/8”-16

thread on one end, 1/4”-

20 on the other.

(PART # 26312)

Microphone stand adapter, 1

1/2” long. 5/8”- 27 thread on

one end, with 3/8”-16 thread in

other end. Knurled nish.

(PART # 26313)

The components in the ALPKIT can also be ordered

individually by the part numbers shown above.

COAXIAL CABLES Loss:

ARG2 (2 ft. RG-8/X - Belden 9258) .25 dB

ARG2RT (2 ft. RG174/U - Belden 8216) .50 dB

(right angle connectors)

ARG15 (15 ft. RG-8/X - Belden 9258) 1.4 dB

ARG25 (25 ft. RG-8/U - Belden 9913F) 1.9 dB

ARG50 (50 ft. RG-8/U - Belden 9913F) 2.8 dB

ARG100 (100 ft. RG-8/U - Belden 9913F) 4.6 dB

ARX125 (125 ft. RG-8/X - Belden 9258) 12.5 dB

Mini-Circuits® PASSIVE SPLITTERS: Loss:

ZSC24 (2-way) 3.4 dB

ZSC41 (4-way) 6.8 dB

ZSC843 (8-way) 10.2 dB

Specifications

Pattern Gain: +7 dBi (isotropic)

+4 dBd (over dipole)

Passband: Passive: 450 - 850 MHz

Active: 470 - 608 or 470 - 700 MHz, selectable

RF Ampliﬁer Gain Range: -6 to +12 dB in 1 dB steps

Third Order Intercept: +27 dBm @ input; +41 dBm output

Weight: 13 ozs.; 355 grams

Dimensions: 27 x 33 x 4 cm (11 x 13 x 1.5 in)

Temperature Range: -20° - +45° C ( 4° - 113° F)

Power Requirements: DC bias on center pin of coaxial cable;

8V to 16V DC; 1.5 W max.; polarity protected

Active LPDA Antenna

Rio Rancho, NM 7

Service and Repair

If your system malfunctions, you should attempt to correct or isolate the trouble before concluding that the equipment

needs repair. Make sure you have followed the setup procedure and operating instructions. Check the interconnecting

cables and then go through the Troubleshooting section in this manual.

We strongly recommend that you do not try to repair the equipment yourself and do not have the local repair shop at-

tempt anything other than the simplest repair. If the repair is more complicated than a broken wire or loose connection,

send the unit to the factory for repair and service. Don’t attempt to adjust any controls inside the units. Once set at the

factory, the various controls and trimmers do not drift with age or vibration and never require readjustment. There are

no adjustments inside that will make a malfunctioning unit start working.

LECTROSONICS’ Service Department is equipped and staed to quickly repair your equipment. In warranty repairs

are made at no charge in accordance with the terms of the warranty. Out-of-warranty repairs are charged at a modest

at rate plus parts and shipping. Since it takes almost as much time and eort to determine what is wrong as it does to

make the repair, there is a charge for an exact quotation. We will be happy to quote approximate charges by phone for

out-of-warranty repairs.

Returning Units for Repair

For timely service, please follow the steps below:

A. DO NOT return equipment to the factory for repair without rst contacting us by email or by phone. We need

to know the nature of the problem, the model number and the serial number of the equipment. We also need a

phone number where you can be reached 8 A.M. to 4 P.M. (U.S. Mountain Standard Time).

B. After receiving your request, we will issue you a return authorization number (R.A.). This number will help speed

your repair through our receiving and repair departments. The return authorization number must be clearly

shown on the outside of the shipping container.

C. Pack the equipment carefully and ship to us, shipping costs prepaid. If necessary, we can provide you with the

proper packing materials. UPS is usually the best way to ship the units. Heavy units should be “double-boxed”

for safe transport.

D. We also strongly recommend that you insure the equipment, since we cannot be responsible for loss of or dam-

age to equipment that you ship. Of course, we insure the equipment when we ship it back to you.

Lectrosonics USA:

Mailing address: Shipping address: Telephone:

Lectrosonics, Inc. Lectrosonics, Inc. (505) 892-4501

PO Box 15900 561 Laser Rd. NE, Suite 102 (800) 821-1121 Toll-free

Rio Rancho, NM 87174 Rio Rancho, NM 87124 (505) 892-6243 Fax

USA USA

Web: E-mail:

www.lectrosonics.com [email protected]

service.repair@lectrosonics.com

Lectrosonics Canada:

Mailing Address: Telephone: E-mail:

720 Spadina Avenue, (416) 596-2202 Sales: [email protected]

Suite 600 (877) 753-2876 Toll-free Service: joeb@lectrosonics.com

Toronto, Ontario M5S 2T9 (877-7LECTRO)

(416) 596-6648 Fax

Self-Help Options for Non-Urgent Concerns

Our Facebook groups and weblists are a wealth of knowledge for user questions and information. Refer to:

Lectrosonics General Facebook Group: https://www.facebook.com/groups/69511015699

D Squared, Venue 2 and Wireless Designer Group: https://www.facebook.com/groups/104052953321109

The Wire Lists: https://lectrosonics.com/the-wire-lists.html

16 August 2022

LIMITED ONE YEAR WARRANTY

The equipment is warranted for one year from date of purchase against defects in

materials or workmanship provided it was purchased from an authorized dealer. This

warranty does not cover equipment which has been abused or damaged by careless

handling or shipping. This warranty does not apply to used or demonstrator equipment.

Should any defect develop, Lectrosonics, Inc. will, at our option, repair or replace any

defective parts without charge for either parts or labor. If Lectrosonics, Inc. cannot

correct the defect in your equipment, it will be replaced at no charge with a similar new

item. Lectrosonics, Inc. will pay for the cost of returning your equipment to you.

This warranty applies only to items returned to Lectrosonics, Inc. or an authorized

dealer, shipping costs prepaid, within one year from the date of purchase.

This Limited Warranty is governed by the laws of the State of New Mexico. It states the

entire liablility of Lectrosonics Inc. and the entire remedy of the purchaser for any

breach of warranty as outlined above. NEITHER LECTROSONICS, INC. NOR

ANYONE INVOLVED IN THE PRODUCTION OR DELIVERY OF THE EQUIPMENT

SHALL BE LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, CONSEQUENTIAL,

OR INCIDENTAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE

THIS EQUIPMENT EVEN IF LECTROSONICS, INC. HAS BEEN ADVISED OF THE

POSSIBILITY OF SUCH DAMAGES. IN NO EVENT SHALL THE LIABILITY OF

LECTROSONICS, INC. EXCEED THE PURCHASE PRICE OF ANY DEFECTIVE

EQUIPMENT.

This warranty gives you specific legal rights. You may have additional legal rights which

vary from state to state.

581 Laser Road NE • Rio Rancho, NM 87124 USA • www.lectrosonics.com

+1(505) 892-4501 • fax +1(505) 892-6243 • (800) 821-1121 US and Canada • [email protected]

Lectrosonics ALP690 User manual

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